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Xiaofeng Zhao1, Dongxiao Wang2

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This study presents an ocean acoustic tomography inversion using transmission losses in shallow water. The adjoint method effectively reconstructs sound-speed profiles, overcoming ill-posedness with regularization.

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Area of Science:

  • Oceanography
  • Acoustics
  • Geophysics

Background:

  • Ocean acoustic tomography is crucial for understanding underwater environments.
  • Traditional methods often use complex pressure fields, posing challenges in shallow water.
  • Transmission loss offers an alternative observation for acoustic inversions.

Purpose of the Study:

  • To develop and validate an ocean acoustic tomography inversion method for shallow water environments.
  • To utilize transmission losses as the primary observation data.
  • To address the ill-posed nature of acoustic inverse problems.

Main Methods:

  • Employed an adjoint method for ocean acoustic tomography inversion.
  • Utilized an implicit Crank-Nicolson finite difference parabolic equation solver.
  • Applied a linear differential regularization operator and the L-curve criterion for parameter selection.

Main Results:

  • Successfully performed inversions in numerical simulations with sparse horizontal and vertical hydrophone distributions.
  • Demonstrated the effectiveness of the adjoint method with transmission loss data.
  • Showcased the regularization technique's ability to stabilize inversion results.

Conclusions:

  • The adjoint method with transmission loss is a viable approach for shallow water acoustic tomography.
  • Regularization is essential for managing the ill-posed inverse problem.
  • The L-curve criterion provides an effective means for selecting regularization parameters.